Abstract
We present vector magnetograph data of 6 active regions, all of which produced major flares. Of the 20 M-class (or above) flares, 7 satisfy the flare conditions prescribed by Hagyard (high shear and strong transverse fields). Strong photospheric shear, however, is not necessarily a condition for a flare. We find an increase in the shear for two flares, a 6-deg shear increase along the neutral line after a X-2 flare and a 13-deg increase after a M-1.9 flare. For other flares, we did not detect substantial shear changes.
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Visiting Associate from Beijing Astronomical Observatory, Chinese Academy of Sciences, Beijing 100080, China.
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Chen, J., Wang, H., Zirin, H. et al. Observations of vector magnetic fields in flaring active regions. Sol Phys 154, 261–273 (1994). https://doi.org/10.1007/BF00681099
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DOI: https://doi.org/10.1007/BF00681099